Pre-Installation
23
Greenstar 4000 – 6 720 891 162 (2020/09)
Vertical flue terminal positions
Fig. 32 Vertical flue terminal positions
Key to figure 32:
[1]
1,500mm measured between a vertical flue terminal and an
opening or vented window. 500mm measured horizontally
between a vertical flue terminal and an opening or vented window
providing the flue terminal is at least 300mm above the opening.
[2]
Minimum clearance to an additional flue, 600mm to a room
sealed flue or 1,500mm to an open flue.
[3]
300mm clearance from a vertical flue terminal adjacent to a
boundary line, unless it will cause a nuisance. BS 5440: Part 1
recommends that care is taken when siting a terminal in relation to
boundary lines.
[4]
600mm minimum clearance measured from an opening or vented
skylight to a vertical flue terminal. If the terminal is within
1,500mm of the opening or vented skylight then it must be at
least 300mm above the opening.
[5]
500mm clearance measured horizontally from a vertical flue to a
vertical structure.
Not required if the terminal is 300mm above the structure.
[6]
The flue must not penetrate the roof in the shaded area.
The terminal must be at least 1,500mm from the opening or vent
when sited below the window or 600mm when sited to either side
or above.
[7]
400mm measured diagonally from a pitched roof or 500mm in
regions with heavy snow fall. 300mm measured vertically from
the air intake to the closest intersection with the roof.
[8]
1,200mm separation measured between a vertical flue and a
horizontal flue terminal.
[9]
For the purpose of determining suitable flue terminal positions for
gas appliances, the boundary can be considered to extend to the
centre line of any adjacent routes or waterways e.g. paths,
streets, rights of way, canals, rivers or railways.
[10] 1,500mm measured between a vertical flue terminal and an
opening or vented window. 500mm measured horizontally
between a vertical flue terminal and an opening or vented window
providing the flue terminal is at least 300mm above the opening.
Note:
▶ Where a vertical flue terminates in an area that is enclosed on 3 sides,
the flue must be no more than 1,000mm below the lowest roof line.
You must ensure that all clearances are maintained and that products
of combustion disperse safely from the area.
BOUNDARY LINE
600
600
500
1500
1200
300
300
1500
500
400
600
600
600
2000
1500
RIDGE FLUE
RIDGE VENT
1500
1500
300
400
600
300
1500
10
2
2
2
3
4
5
5
500
5
6
7
7
8
1
BOUNDARIES
1/2
1/2
9
0010021441-002
